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        <h1 class="title">Spring MVC之文件上传与下载</h1>
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                <time datetime="2019-05-28T21:01:46.000Z" itemprop="datePublished" class="page-time">
  2019-05-28
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            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-Spring-MVC之文件的上传与下载"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : Spring MVC之文件的上传与下载</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#文件上传"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">文件上传</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#文件上传案例"><span class="post-toc-number">1.1.1.</span> <span class="post-toc-text">文件上传案例</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#文件下载"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">文件下载</span></a></li></ol></li></ol>
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<article id="post-Spring-MVC之文件上传与下载"
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        <h1 class="post-card-title">Spring MVC之文件上传与下载</h1>
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            <time class="post-time" title="2019-05-28 21:01:46" datetime="2019-05-28T21:01:46.000Z"  itemprop="datePublished">2019-05-28</time>

            


            

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            <h2 id="学习笔记-Spring-MVC之文件的上传与下载"><a href="#学习笔记-Spring-MVC之文件的上传与下载" class="headerlink" title="学习笔记 : Spring MVC之文件的上传与下载"></a>学习笔记 : <code>Spring MVC</code>之文件的上传与下载</h2><h3 id="文件上传"><a href="#文件上传" class="headerlink" title="文件上传"></a>文件上传</h3><p><em>简介 : 多数文件上传都是通过表单形式提交给服务器的,因此,要实现文件长传功能后,就需要提供一个文件上传的表单,而表单必须满足以下三个条件.</em></p>
<ul>
<li><em>form表单的method的属性设置为<code>post</code></em></li>
<li><em>form表单的enctype属性设置为<code>multipart/form-data</code></em></li>
<li><em>提供<code>&lt;input type=&quot;file&quot; name=&quot;filename&quot;/&gt;</code>的文件上传输入框</em></li>
</ul>
<p><em>当客户端form表单的<code>enctype</code>属性为<code>multipart/form-data</code>时,浏览器就会采用二进制流的方式来处理表单数据,服务器端就会对文件上传的请求进行解析处理. Spring MVC为文件上传提供了支持,这种支持是通过<code>MultipartResolver</code>(多部件解析器)对象实现的. MultipartResolver是一个接口对象,需要通过它的实现类<code>CommonsMultipartResolver</code>来完成文件的上传工作,在需要在spring mvc配置文件中定义MultipartResolver接口的Bean即可,其配置方式如下 :</em></p>
<ul>
<li><p><em>springmvc-config.xml</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 配置文件上传解析器:MultipartResolver --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"multipartResolver"</span> <span class="attr">class</span>=<span class="string">"org.springframework.web.multipart.commons.CommonsMultipartResolver"</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 设置请求编码格式 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"defaultEncoding"</span> <span class="attr">value</span>=<span class="string">"UTF-8"</span>/&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 设置允许上传文件的最大值(10MB),单位为字节 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"maxUploadSize"</span> <span class="attr">value</span>=<span class="string">"20971520"</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>注意: 因为<code>MultipartResolver</code>接口的实现类<code>CommonsMultipartResolver</code>内部是引用<code>multipartResolver</code>字符串获取该实现类对象并完成文件解析的,所以在配置<code>CommonsMultipartResolver</code>时必须指定该Bean的id为multipartResolver</em></p>
</li>
</ul>
<h4 id="文件上传案例"><a href="#文件上传案例" class="headerlink" title="文件上传案例"></a>文件上传案例</h4><ol>
<li><p><em>web.xml</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">web-app</span> <span class="attr">xmlns</span>=<span class="string">"http://xmlns.jcp.org/xml/ns/javaee"</span></span></span><br><span class="line"><span class="tag">         <span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span></span></span><br><span class="line"><span class="tag">         <span class="attr">xsi:schemaLocation</span>=<span class="string">"http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"</span></span></span><br><span class="line"><span class="tag">         <span class="attr">version</span>=<span class="string">"4.0"</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">welcome-file-list</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">welcome-file</span>&gt;</span>index.jsp<span class="tag">&lt;/<span class="name">welcome-file</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">welcome-file-list</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!-- 配置Spring MVC前端控制器 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">servlet</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">servlet-name</span>&gt;</span>spring_mvc<span class="tag">&lt;/<span class="name">servlet-name</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">servlet-class</span>&gt;</span>org.springframework.web.servlet.DispatcherServlet<span class="tag">&lt;/<span class="name">servlet-class</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 指定Spring MVC核心配置文件路径 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">init-param</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">param-name</span>&gt;</span>contextConfigLocation<span class="tag">&lt;/<span class="name">param-name</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">param-value</span>&gt;</span>classpath:springmvc-config.xml<span class="tag">&lt;/<span class="name">param-value</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">init-param</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 使服务器启动后立即加载Spring MVC核心配置文件 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">load-on-startup</span>&gt;</span>1<span class="tag">&lt;/<span class="name">load-on-startup</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">servlet</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">servlet-mapping</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">servlet-name</span>&gt;</span>spring_mvc<span class="tag">&lt;/<span class="name">servlet-name</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">url-pattern</span>&gt;</span>/<span class="tag">&lt;/<span class="name">url-pattern</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">servlet-mapping</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">web-app</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Springmvc-config.xml : Spring MVC核心配置文件</em></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">beans</span> <span class="attr">xmlns</span>=<span class="string">"http://www.springframework.org/schema/beans"</span></span></span><br><span class="line"><span class="tag">       <span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span></span></span><br><span class="line"><span class="tag">       <span class="attr">xmlns:context</span>=<span class="string">"http://www.springframework.org/schema/context"</span></span></span><br><span class="line"><span class="tag">       <span class="attr">xmlns:mvc</span>=<span class="string">"http://www.springframework.org/schema/mvc"</span></span></span><br><span class="line"><span class="tag">       <span class="attr">xsi:schemaLocation</span>=<span class="string">"http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd</span></span></span><br><span class="line"><span class="tag"><span class="string">		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd</span></span></span><br><span class="line"><span class="tag"><span class="string">		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!-- 定义组件扫描器,指定需要扫描的包 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">context:component-scan</span> <span class="attr">base-package</span>=<span class="string">"pers.huangyuhui.file.controller"</span>/&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!-- 注解驱动 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">mvc:annotation-driven</span>/&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!-- 视图解析器 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"viewResolver"</span> <span class="attr">class</span>=<span class="string">"org.springframework.web.servlet.view.InternalResourceViewResolver"</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"prefix"</span> <span class="attr">value</span>=<span class="string">"/WEB-INF/view/"</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"suffix"</span> <span class="attr">value</span>=<span class="string">".jsp"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line">    </span><br><span class="line">    <span class="comment">&lt;!-- 配置文件上传解析器:MultipartResolver --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"multipartResolver"</span> <span class="attr">class</span>=<span class="string">"org.springframework.web.multipart.commons.CommonsMultipartResolver"</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 设置请求编码格式 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"defaultEncoding"</span> <span class="attr">value</span>=<span class="string">"UTF-8"</span>/&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 设置允许上传文件的最大值(10MB),单位为字节 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">"maxUploadSize"</span> <span class="attr">value</span>=<span class="string">"20971520"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">beans</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>upload.jsp : 文件上传页面</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%--</span></span></span><br><span class="line"><span class="tag">  <span class="attr">Created</span> <span class="attr">by</span> <span class="attr">IntelliJ</span> <span class="attr">IDEA.</span></span></span><br><span class="line"><span class="tag">  <span class="attr">User:</span> <span class="attr">Administrator</span></span></span><br><span class="line"><span class="tag">  <span class="attr">Date:</span> <span class="attr">6</span>/<span class="attr">1</span>/<span class="attr">2019</span></span></span><br><span class="line"><span class="tag">  <span class="attr">Time:</span> <span class="attr">4:01</span> <span class="attr">PM</span></span></span><br><span class="line"><span class="tag"><span class="attr">--</span>%&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">contentType</span>=<span class="string">"text/html;charset=UTF-8"</span> %&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>upload file<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 验证表单信息 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span>&gt;</span></span><br><span class="line"><span class="actionscript">        <span class="function"><span class="keyword">function</span> <span class="title">check</span><span class="params">()</span> </span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">var</span> name = <span class="built_in">document</span>.getElementById(<span class="string">"name"</span>).value;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">var</span> file = <span class="built_in">document</span>.getElementById(<span class="string">"file"</span>).value;</span></span><br><span class="line"><span class="actionscript">            <span class="keyword">if</span> (name === <span class="string">""</span>) &#123;</span></span><br><span class="line"><span class="actionscript">                alert(<span class="string">"请填写上传人 !"</span>);</span></span><br><span class="line"><span class="actionscript">                <span class="keyword">return</span> <span class="literal">false</span>;</span></span><br><span class="line">            &#125;</span><br><span class="line"><span class="actionscript">            <span class="keyword">if</span> (file.length === <span class="number">0</span> || file === <span class="string">""</span>) &#123;</span></span><br><span class="line"><span class="actionscript">                alert(<span class="string">"请选择上传文件 !"</span>);</span></span><br><span class="line"><span class="actionscript">                <span class="keyword">return</span> <span class="literal">false</span>;</span></span><br><span class="line">            &#125;</span><br><span class="line"><span class="actionscript">            <span class="keyword">return</span> <span class="literal">true</span>;</span></span><br><span class="line">        &#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"$&#123;pageContext.request.contextPath&#125;/fileUpload"</span></span></span><br><span class="line"><span class="tag">      <span class="attr">method</span>=<span class="string">"post"</span> <span class="attr">enctype</span>=<span class="string">"multipart/form-data"</span> <span class="attr">onsubmit</span>=<span class="string">"return check()"</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    上传人 <span class="tag">&lt;<span class="name">input</span> <span class="attr">id</span>=<span class="string">"name"</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"name"</span> <span class="attr">multiple</span>=<span class="string">"multiple"</span>/&gt;</span><span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">    请选择文件 <span class="tag">&lt;<span class="name">input</span> <span class="attr">id</span>=<span class="string">"file"</span> <span class="attr">type</span>=<span class="string">"file"</span> <span class="attr">name</span>=<span class="string">"uploadfile"</span>/&gt;</span><span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">value</span>=<span class="string">"上传"</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>FileController.java : 文件上传控制器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.file.controller;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.apache.commons.io.FileUtils;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.HttpHeaders;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.HttpStatus;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.MediaType;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.ResponseEntity;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Controller;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RequestMapping;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RequestParam;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.multipart.MultipartFile;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> java.io.File;</span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.io.UnsupportedEncodingException;</span><br><span class="line"><span class="keyword">import</span> java.net.URLEncoder;</span><br><span class="line"><span class="keyword">import</span> java.nio.charset.StandardCharsets;</span><br><span class="line"><span class="keyword">import</span> java.util.List;</span><br><span class="line"><span class="keyword">import</span> java.util.UUID;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: file</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 文件控制器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 6/1/2019-5:17 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Controller</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FileController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@description</span>: upload the specified file</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span>: name 上传人姓名</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span>: uploadfile 上传文件</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span>: request</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@date</span>: 2019-06-08 6:20 PM</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span>: java.lang.String</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="meta">@RequestMapping</span>(<span class="string">"/fileUpload"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">handleFormUpload</span><span class="params">(String name, List&lt;MultipartFile&gt; uploadfile, HttpServletRequest request)</span> </span>&#123;</span><br><span class="line">        <span class="comment">//判断文件是否存在</span></span><br><span class="line">        <span class="keyword">if</span> (!uploadfile.isEmpty() &amp;&amp; uploadfile.size() &gt; <span class="number">0</span>) &#123;</span><br><span class="line">            <span class="comment">//遍历文件</span></span><br><span class="line">            <span class="keyword">for</span> (MultipartFile files : uploadfile) &#123;</span><br><span class="line">                <span class="comment">//获取上传文件的原始名称</span></span><br><span class="line">                String originFileName = files.getOriginalFilename();</span><br><span class="line">                <span class="comment">//设置上传文件的保存地址目录</span></span><br><span class="line">                String dirPath = request.getServletContext().getRealPath(<span class="string">"/upload/"</span>);</span><br><span class="line">                System.out.println(dirPath);</span><br><span class="line">                <span class="comment">//如果保存文件的地址不存在,则创建该目录</span></span><br><span class="line">                File file = <span class="keyword">new</span> File(dirPath);</span><br><span class="line">                <span class="keyword">if</span> (!file.exists()) &#123;</span><br><span class="line">                    file.mkdirs();</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="comment">//使用UUID重新命名上传的文件名称(上传人_uuid_原始文件名称)</span></span><br><span class="line">                String newFileName = name + <span class="string">"_"</span> + UUID.randomUUID() + <span class="string">"_"</span> + originFileName;</span><br><span class="line"></span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    <span class="comment">//使用MultipartFile接口的方法将文件上传保存到目标目录下</span></span><br><span class="line">                    files.transferTo(<span class="keyword">new</span> File(dirPath + newFileName));</span><br><span class="line">                &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">                    e.printStackTrace();</span><br><span class="line">                &#125;</span><br><span class="line"></span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span> <span class="string">"success"</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> <span class="string">"error"</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ol>
<ul>
<li><em>注意: <code>upload</code>文件夹是在项目的发布路径中,而非创建的项目所在路径哟 !</em></li>
</ul>
<h3 id="文件下载"><a href="#文件下载" class="headerlink" title="文件下载"></a>文件下载</h3><p><em>简介 : Spring MVC提供了一个<code>ResponseEntity</code>类型的对象,使用它可以很方便地定义返回的<code>HttpHeaders</code>与<code>HttpStatus</code>对象,通过对这两个对象的设置,既可完成下载文件时所需对的配置信息.</em></p>
<ol>
<li><p><em>download.jsp : 文件下载页面</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%--</span></span></span><br><span class="line"><span class="tag">  <span class="attr">Created</span> <span class="attr">by</span> <span class="attr">IntelliJ</span> <span class="attr">IDEA.</span></span></span><br><span class="line"><span class="tag">  <span class="attr">User:</span> <span class="attr">Administrator</span></span></span><br><span class="line"><span class="tag">  <span class="attr">Date:</span> <span class="attr">6</span>/<span class="attr">1</span>/<span class="attr">2019</span></span></span><br><span class="line"><span class="tag">  <span class="attr">Time:</span> <span class="attr">7:18</span> <span class="attr">PM</span></span></span><br><span class="line"><span class="tag"><span class="attr">--</span>%&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">contentType</span>=<span class="string">"text/html;charset=UTF-8"</span> %&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">import</span>=<span class="string">"java.net.URLEncoder"</span> %&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">import</span>=<span class="string">"java.nio.charset.StandardCharsets"</span> %&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>文件下载<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"$&#123;pageContext.request.contextPath&#125;/fileDownload?filename=&lt;%=URLEncoder.encode("</span>黄宇辉好可耐<span class="attr">.jpg</span>",<span class="attr">StandardCharsets.UTF_8</span>)%&gt;</span>"&gt;</span><br><span class="line">    点击下载图片哟!<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>FileController.java : 文件下载控制器</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.file.controller;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.apache.commons.io.FileUtils;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.HttpHeaders;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.HttpStatus;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.MediaType;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.ResponseEntity;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Controller;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RequestMapping;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.bind.annotation.RequestParam;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.multipart.MultipartFile;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> java.io.File;</span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.io.UnsupportedEncodingException;</span><br><span class="line"><span class="keyword">import</span> java.net.URLEncoder;</span><br><span class="line"><span class="keyword">import</span> java.nio.charset.StandardCharsets;</span><br><span class="line"><span class="keyword">import</span> java.util.List;</span><br><span class="line"><span class="keyword">import</span> java.util.UUID;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@project</span>: file</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@description</span>: 文件操作控制器</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: 6/1/2019-5:17 PM</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span>: 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@website</span>: https://yubuntu0109.github.io/</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Controller</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FileController</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@description</span>: download the specified file</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span>: request</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span>: filename</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@date</span>: 2019-06-08 6:23 PM</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span>: org.springframework.http.ResponseEntity&lt;byte [ ]&gt;</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="meta">@RequestMapping</span>(<span class="string">"/fileDownload"</span>)</span><br><span class="line">    <span class="keyword">public</span> ResponseEntity&lt;<span class="keyword">byte</span>[]&gt; fileDownload(HttpServletRequest request, String filename) <span class="keyword">throws</span> IOException &#123;</span><br><span class="line"></span><br><span class="line">        <span class="comment">//指定要下载的文件的所在路径</span></span><br><span class="line">        String path = request.getServletContext().getRealPath(<span class="string">"/upload/"</span>);</span><br><span class="line">        <span class="comment">//创建该文件对象</span></span><br><span class="line">        File file = <span class="keyword">new</span> File(path + File.separator + filename);</span><br><span class="line">        <span class="comment">//对文件名进行编码,防止中文文件乱码</span></span><br><span class="line">        filename = <span class="keyword">this</span>.getFileName(request, filename);</span><br><span class="line">        <span class="comment">//设置响应头</span></span><br><span class="line">        HttpHeaders httpHeaders = <span class="keyword">new</span> HttpHeaders();</span><br><span class="line">        <span class="comment">//通知浏览器以下载的方式打开文件</span></span><br><span class="line">        httpHeaders.setContentDispositionFormData(<span class="string">"attachment"</span>, filename);</span><br><span class="line">        <span class="comment">//定义以流的形式下载返回文件数据</span></span><br><span class="line">        <span class="comment">//MediaType.APPLICATION_OCTET_STREAM的值为application/octet-stream,既表示以二进制流的形式下载数据</span></span><br><span class="line">        httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);</span><br><span class="line">        <span class="comment">//使用Spring MVC框架的ResponseEntity对象封装返回的下载数据</span></span><br><span class="line">        <span class="comment">//HttpStatus类型代表Http协议中的状态,HttpStatus.OK表示200,既服务器已成功处理了请求</span></span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> ResponseEntity&lt;<span class="keyword">byte</span>[]&gt;(FileUtils.readFileToByteArray(file), httpHeaders, HttpStatus.OK);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@description</span>: 根据浏览器的不同进行编码设置, 返回编码后的文件名</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span>: request</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span>: filename</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@date</span>: 2019-06-08 6:24 PM</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span>: java.lang.String</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getFileName</span><span class="params">(HttpServletRequest request, String filename)</span> <span class="keyword">throws</span> UnsupportedEncodingException </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="comment">//IE不同版本的User-Agent中出现的关键字</span></span><br><span class="line">        String[] IEBrowserkeyWords = &#123;<span class="string">"MSIE"</span>, <span class="string">"Trident"</span>, <span class="string">"Edge"</span>&#125;;</span><br><span class="line">        <span class="comment">//获取请求头代理信息</span></span><br><span class="line">        String userAgent = request.getHeader(<span class="string">"User-Agent"</span>);</span><br><span class="line">        <span class="keyword">for</span> (String keyWork : IEBrowserkeyWords) &#123;</span><br><span class="line">            <span class="keyword">if</span> (userAgent.contains(keyWork)) &#123;</span><br><span class="line">                <span class="comment">//IE内核浏览器,统一设置为UTF-8编码显示</span></span><br><span class="line">                <span class="keyword">return</span> URLEncoder.encode(filename, StandardCharsets.UTF_8.name());</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">//火狐等其它浏览器统一设置为ISO-8859-1编码显示</span></span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> String(filename.getBytes(StandardCharsets.UTF_8.name()), StandardCharsets.ISO_8859_1.name());</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
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